Paul Nunn

Sun 17 Nov 2013 07:41pm

Black mould on walls is normally caused by condensation, which is a build up of moisture within the property. When this moisture comes into contact with a cold surface then the condensation is formed. Remedies include provide adequate ventilation throughout the property, open windows when cooking, do not dry clothes on radiators, and keep the property warm. If the problem persists then you could install a dehumidifier. The black mould which forms as a result of condensation can be removed with common household bleach. Care should be taken when applying to coloured surfaces.

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Kostadin Bakardzhiev

Mon 18 Nov 2013 07:26pm

seal it with damp sealer and repaint , but first fix the moisture problem

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Matthew Eastwood

Mon 18 Nov 2013 08:39am

As already said, ventilation is your problem, check your air bricks haven't been plastered over inside or rendered over on the outside. I've lost count of the amount of air bricks I have had to reinstate this year, it all started in the big double glazing boom many years ago.

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Andrew Smith

Sun 17 Nov 2013 08:38pm

Hi, If the mould is on the interior of the wall you can try sanding the area with some course sand paper, was with diluted bleach, rinse off and it should be ready for painting. Andy

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Louis De Courcey

Sun 17 Nov 2013 08:26pm

It depends where the mould is , it could be air ventilation is the problem , or rising damp .Or it could be from the external wall causing damp on the inside. Contact a good builder on rated people with good ratings.

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